You could try and present him with the fact that he screwed himself over during the war, but then he might just fling mashed potatoes at you with his spoon and then whisper about you to his SS buddies.

So I went to /_/ and got the great idea of taking this pic from a motivational poster thread with Hitler stealing some guys seat that said when Hitler takes your seat what can you do then suddenly this f*ggot beats me to the punch